Bring soups, Ro-Tel and broth to a boil.,Saute onion and add to soup mixture.,______,Grease a baking dish; then start with chips on bottom, then soup mixture and continue doing this until soup mixture is gone, being sure you end with soup mixture on top. Place in 400° oven for 10 to 15 minutes.,Then place cheese on top and cook until cheese melts and casserole is bubbling.